Does anyone else have to renew their DHCP Lease every 30 seconds when using the internet?

Everytime I want to use the internet for surfing the web or browsing iTunes etc I have to go into System Preferences and navigate through to a button that says "Renew DHCP Lease". If watching catch-up TV online I have to click this button every 30 seconds or so because the programme freezes, and if I'm surfing the web or browsing iTunes I have to click it every time I want to update the content of the page. Does anybody know what my problem might be?

This Fix has got things working for me.
I have reprinted this response from another thread I have made (Repost) A number of people were asking me about my fix, so I have expanded my response to hopefully offer a little more clarity.
I was having this problem the other night after I finished doing a massive upgrade to our Home Network (New Router, Modem, Cabling, Etc)
I had to reset my DHCP lease every few minutes, in the end I found Mac Mini's IP Address kept setting itself to other items on the Network, I have some items connected on wired (ethernet) and some were connected on WiFi (Airport Extreme) after clicking the DHCP Lease Renew the Mac Mini would grab an IP address that it thought was available but then another item on my network would "check in" then we would have a clash, The Mac Mini was grabbing what it thought was an available IP address, the DHCP Renew button was not setting the Mac Mini's IP number far enough away to stop the clash.
I was watching the items on my Routers Attached devices screen, The Mac Mini would show up on the page with its new address (after hitting the DHCP Renewal button) then something else would check in with that exisiting IP Address, clash and the Mac Mini would need it's DHCP lease renewed again.
My Network consists of:
- Mac Mini (Wired)
- Acer Laptop (Wired)
- PS3 (1) (wired)
- Apple TV (wired)
- Airport Extreme (wired and looking ater WiFi duties throughout the house)
- PS3 (2) (WiFi)
- TV (WiFi)
- iPad (WiFi)
- Nexus 7 (WiFi)
- Printer (WiFi)
I'll be the first to admit my Networking knowledge is limited (and I'm learning more all the Time) but I simply went into the preferences panel and set the IP address manually.
1. I went into Preferences and selected Network
2. Set Configure IPV4 to: using DHCP with manual address
Now it helped I had my NetGear Routers "Attached devices" Page open here so I could see the address of everything else on my network (I went and switched everything on that was web connected so it would be logged in and running on the network) I looked at the last digit or 2 of every item on my network and then set my new IP address.
3. To ensure I wouldn't have any more clashes I set my new IP address far away from the the others* your only changing the last digit or 2 of the IP address, so in the case of my Mac Mini it went from
xxx.xxx.02 to xxx.xxx.0.52 (note the x's are normally your IP address numbers)
*I originally set it to xxx.xxx.09 but I since found the TV had that IP address (The one thing I forgot to check the previous night) so I this is when I decided to set it far away from the rest of the bunch by setting it to .52 (No specific reason for 52, that was just the 1st number to pop into my head)
Now that was over a week ago and since then I have had no more issues on my Network, so far everything is running smooth and fast. (It has now been over 3 weeks since I posted this, and everything is still working perfectly, I suggested this solution to 2 friends having the same issue and it also fixed there problems as well)
I'm not saying this is the be all and end all to the problem, there must be a more permanent solution out there, but this is working for me so far.

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